This article guides you on how you can install PIP in windows, Linux, and macOS in few simple steps from the get-pip.py script.

A pt install python3-pip will still python3.8, which I don't want; it gives interference with the python3.9 modules. os information Ubuntu 20.04 lsb_release -a ...

Take control of multiple Python installations in Windows with the py launcher, available as part of a standard Python installation.